At present, there are three main methods to offer voice services to LTE
users: circuit switched fallback (CSFB), dual standby and VoLTE. The CSFB
solution requires operators to hand off voice calls to slower 2G or 3G networks.
The dual standby solution requires terminals to support the 2G/3G and 4G
services simultaneously, with the 2G/3G network dedicated to providing voice
services. VoLTE is an IMS-based voice service with voice transmitted as IP data
and can be entirely supported by the LTE network without 2G or 3G networks.

Compared with the CSFB and dual standby solutions, the VoLTE solution offers
superior voice quality and lower latency with improved energy consumption for
terminals, delivering a better user experience for 4G services. Therefore, VoLTE
is considered as the ultimate goal of evolution for LTE voice solutions.

Compared with 2G and 3G networks, VoLTE features higher spectral efficiency
in voice services, which enables operators to support a greater number of voice
users for the same amount of spectrum. Although the voice data is transmitted
through IP packet data, VoLTE offers better user experience than 2G and 3G voice
service. Performance is also superior to over-the-top (OTT) services as VoLTE
features carrier-class QoS and HD codec technology. For operators, VoLTE enables
the integration of data and voice services in a network, helping them reduce the
complexity of Operation Support Systems (OSS) and achieve greater efficiency.

As mobile devices, TD-LTE wireless networks and IMS platforms become more
mature, more VoLTE services will be deployed.

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